GM Metro/Sprint 1985-1993 Repair Guide

Radiator Fan Thermostat Switch

Print

A temperature switch is used to control the operation of the radiator fan. The switch closes (continuity) at 208-215°F (98-102°C) to turn the fan ON. The switch is closed when the coolant temperature (no continuity) when the coolant temperature is 199-206°F (93-97°C) to turn the fan OFF.

REMOVAL and INSTALLATION

See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Checking coolant temperature switches and senders

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system below the level of the thermostat housing.
  4.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the radiator fan thermostat switch electrical connector.
  2.  
  3. Remove the switch from the thermostat housing.
  4.  

To install:
  1. Coat the thermostat switch with sealant and install in the thermostat housing.
  2.  
  3. Connect the radiator fan thermostat switch electrical connector.
  4.  
  5. Fill the cooling system.
  6.  
  7. Connect the negative battery cable.
  8.  

 
label.common.footer.alt.autozoneLogo